Power Unit; Checking The Engine Oil Level; Checking The Spark Plug; Checking The Thermostat - Yamaha 250GETO Service Manual

CHK
ADJ

Power unit

Checking the engine oil level

1. Place the outboard motor in an upright
position.
2. Check the engine oil level.
3. Make sure the oil level is between the
upper 1 and lower 2 level marks.
Recommended engine oil:
YAMALUBE 2-stroke outboard
motor oil

Checking the spark plug

1. Disconnect the spark plug caps, and then
remove the spark plugs.
2. Clean the electrodes 1 with a spark plug
cleaner or wire brush. Replace the spark
plug if necessary.
3. Check the electrodes for erosion and
excessive carbon or other deposits, and
the gasket for damage. Replace the
spark plug if necessary.
3-3
Periodic check and adjustment
1
2
6S330250
1
6B430025
4. Check the spark plug gap a. Adjust if out
of specification.
Specified spark plug:
BR8HS-10 (NGK)
Spark plug gap a:
0.9–1.0 mm (0.035–0.039 in)
5. Install the spark plug temporary tight,
then to the specified torque with a spark
plug wrench.
Spark plug:
25 N·m (2.5 kgf·m, 18.4 ft·lb)

Checking the thermostat

1. Remove the thermostat covers 1, gas-
kets 2, and thermostats 3.
1
3
2
2. Suspend the thermostats 3 in a con-
tainer with water.
a
6B430030
6S330110
6S35H11